text: // dear imgui: Platform Backend for GLUT/FreeGLUT
  // This needs to be used along with a Renderer (e.g. OpenGL2)
  
  // !!! GLUT/FreeGLUT IS OBSOLETE SOFTWARE. Using GLUT is not recommended unless you really miss the 90's. !!!
  // !!! If someone or something is teaching you GLUT in 2020, you are being abused. Please show some resistance. !!!
  // !!! Nowadays, prefer using GLFW or SDL instead!
  
  // Issues:
  //  [ ] Platform: GLUT is unable to distinguish e.g. Backspace from CTRL+H or TAB from CTRL+I
  //  [ ] Platform: Missing mouse cursor shape/visibility support.
  //  [ ] Platform: Missing clipboard support (not supported by Glut).
  //  [ ] Platform: Missing gamepad support.
  
  // You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
  // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
  // Read online: https://github.com/ocornut/imgui/tree/master/docs
  
  #pragma once
  #ifndef IMGUI_STATIC_LIBRARY
  #include "imgui.h"      // IMGUI_IMPL_API
  #else
  #include <imgui.h>		// IMGUI_IMPL_API
  #endif      // IMGUI_IMPL_API
  
  IMGUI_IMPL_API bool     ImGui_ImplGLUT_Init();
  IMGUI_IMPL_API void     ImGui_ImplGLUT_InstallFuncs();
  IMGUI_IMPL_API void     ImGui_ImplGLUT_Shutdown();
  IMGUI_IMPL_API void     ImGui_ImplGLUT_NewFrame();
  
  // You can call ImGui_ImplGLUT_InstallFuncs() to get all those functions installed automatically,
  // or call them yourself from your own GLUT handlers. We are using the same weird names as GLUT for consistency..
  //---------------------------------------- GLUT name --------------------------------------------- Decent Name ---------
  IMGUI_IMPL_API void     ImGui_ImplGLUT_ReshapeFunc(int w, int h);                           // ~ ResizeFunc
  IMGUI_IMPL_API void     ImGui_ImplGLUT_MotionFunc(int x, int y);                            // ~ MouseMoveFunc
  IMGUI_IMPL_API void     ImGui_ImplGLUT_MouseFunc(int button, int state, int x, int y);      // ~ MouseButtonFunc
  IMGUI_IMPL_API void     ImGui_ImplGLUT_MouseWheelFunc(int button, int dir, int x, int y);   // ~ MouseWheelFunc
  IMGUI_IMPL_API void     ImGui_ImplGLUT_KeyboardFunc(unsigned char c, int x, int y);         // ~ CharPressedFunc
  IMGUI_IMPL_API void     ImGui_ImplGLUT_KeyboardUpFunc(unsigned char c, int x, int y);       // ~ CharReleasedFunc
  IMGUI_IMPL_API void     ImGui_ImplGLUT_SpecialFunc(int key, int x, int y);                  // ~ KeyPressedFunc
  IMGUI_IMPL_API void     ImGui_ImplGLUT_SpecialUpFunc(int key, int x, int y);                // ~ KeyReleasedFunc
  